U049FInvalid Data Received From Transmission Range Control Module
- Generic OBD-II code · Network
- Can trigger limp mode
- How the car detects it
- The transmission range control module (TRCM) is the shift-by-wire actuator that physically moves the transmission between P, R, N and D after the driver selects a range electronically. U049F is stored by a module that receives TRCM messages whose content it rejects. Ford lists U049F in its 2014 OBD code chart without the MIL marker it gives to other codes such as U04A4. GM fitted a TRCM to the 2017 LaCrosse and XT5: under program 17075 a broken actuator gear left cars stuck in Park, and bulletin 16-NA-373 cured a calibration fault that lit the MIL with a transmission warning by reprogramming. U019E stands for lost contact, U031A for software mismatch, U04BD for the park lock module. Drivers may see a shift warning, a wrong gear display or a car that will not leave Park.
- What you may notice
- Shift system or transmission service message
- Vehicle stays in Park or does not engage the selected range
- Gear indicator disagrees with the selected range
- Likely causes
- LikelyTRCM electronics or actuator position sensing faulty
- PossibleOutdated TRCM calibration (GM 16-NA-373 calls for reprogramming)
- PossibleBus wiring or connector fault at the transmission-mounted module
- RareLow or unstable battery voltage while shifting
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.